#if CHECKSUM_GEN_*
  <code>
#else
if ((netif->flags | NETIF_FLAG_POINTTOPOINT) != 0) {
  тот же самый <code>
}
#endif

#if CHECKSUM_GEN_*
  <code>
#endif

cat /dev/random | nc -u 172.16.0.100 22222

static
void udpTestTask(void * pvParameters) {
while (inet_setup == 0) {
vTaskDelay(1000 / portTICK_RATE_MS);
}
printf("udpTestTask started\r\n");
struct netconn * conn;
struct netbuf * buf;
err_t err;
(void)err;
conn = netconn_new(NETCONN_UDP);
netconn_bind(conn, IP_ADDR_ANY, 22222);
for (;;) {
err = netconn_recv(conn, &buf);
printf("rcvd length = %u\r\n", buf->p->tot_len);
netbuf_delete(buf);
}
}

/**
******************************************************************************
* @file lwipopts.h
* @author MCD Application Team
* @version V1.0.0
* @date 31-October-2011
* @brief lwIP Options Configuration.
* This file is based on Utilities\lwip_v1.3.2\src\include\lwip\opt.h
* and contains the lwIP configuration for the STM32F4x7 demonstration.
******************************************************************************
* @attention
*
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*
* <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2>
******************************************************************************
*/

#ifndef __LWIPOPTS_H__
#define __LWIPOPTS_H__

/**
* SYS_LIGHTWEIGHT_PROT==1: if you want inter-task protection for certain
* critical regions during buffer allocation, deallocation and memory
* allocation and deallocation.
*/
#define SYS_LIGHTWEIGHT_PROT 1

#define ETHARP_TRUST_IP_MAC 0
#define IP_REASSEMBLY 1
#define IP_FRAG 0
#define ARP_QUEUEING 0

/**
* NO_SYS==1: Provides VERY minimal functionality. Otherwise,
* use lwIP facilities.
*/
#define NO_SYS 0

/* ---------- Memory options ---------- */
/* MEM_ALIGNMENT: should be set to the alignment of the CPU for which
lwIP is compiled. 4 byte alignment -> define MEM_ALIGNMENT to 4, 2
byte alignment -> define MEM_ALIGNMENT to 2. */
#define MEM_ALIGNMENT 4

/* MEM_SIZE: the size of the heap memory. If the application will send
a lot of data that needs to be copied, this should be set high. */
#define MEM_SIZE (4*1024)

/* MEMP_NUM_PBUF: the number of memp struct pbufs. If the application
sends a lot of data out of ROM (or other static memory), this
should be set high. */
#define MEMP_NUM_PBUF 8
/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
per active UDP "connection". */
#define MEMP_NUM_UDP_PCB 2
/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
connections. */
#define MEMP_NUM_TCP_PCB 2
/* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
connections. */
#define MEMP_NUM_TCP_PCB_LISTEN 5
/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
segments. */
#define MEMP_NUM_TCP_SEG 16
/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active
timeouts. */
#define MEMP_NUM_SYS_TIMEOUT 7


/* ---------- Pbuf options ---------- */
/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */
#define PBUF_POOL_SIZE 24

/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
#define PBUF_POOL_BUFSIZE 512


/* ---------- TCP options ---------- */
#define LWIP_TCP 1
#define TCP_TTL 255

/* Controls if TCP should queue segments that arrive out of
order. Define to 0 if your device is low on memory. */
#define TCP_QUEUE_OOSEQ 1

/* TCP Maximum segment size. */
#define TCP_MSS (1500 - 40) /* TCP_MSS = (Ethernet MTU - IP header size - TCP header size) */

/* TCP sender buffer space (bytes). */
#define TCP_SND_BUF (5*TCP_MSS)

/* TCP_SND_QUEUELEN: TCP sender buffer space (pbufs). This must be at least
as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work. */

#define TCP_SND_QUEUELEN (2* TCP_SND_BUF/TCP_MSS)

/* TCP receive window. */
#define TCP_WND (2*TCP_MSS)


/* ---------- ICMP options ---------- */
#define LWIP_ICMP 1


/* ---------- DHCP options ---------- */
/* Define LWIP_DHCP to 1 if you want DHCP configuration of
interfaces. DHCP is not implemented in lwIP 0.5.1, however, so
turning this on does currently not work. */
#define LWIP_DHCP 1


/* ---------- UDP options ---------- */
#define LWIP_UDP 1
#define UDP_TTL 255


/* ---------- Statistics options ---------- */
#define LWIP_STATS 0
#define LWIP_PROVIDE_ERRNO 1


/*
--------------------------------------
---------- Checksum options ----------
--------------------------------------
*/

/*
The STM32F4x7 allows computing and verifying the IP, UDP, TCP and ICMP checksums by hardware:
- To use this feature let the following define uncommented.
- To disable it and process by CPU comment the the checksum.
*/
#define CHECKSUM_BY_HARDWARE


#ifdef CHECKSUM_BY_HARDWARE
/* CHECKSUM_GEN_IP==0: Generate checksums by hardware for outgoing IP packets.*/
#define CHECKSUM_GEN_IP 0
/* CHECKSUM_GEN_UDP==0: Generate checksums by hardware for outgoing UDP packets.*/
#define CHECKSUM_GEN_UDP 0
/* CHECKSUM_GEN_TCP==0: Generate checksums by hardware for outgoing TCP packets.*/
#define CHECKSUM_GEN_TCP 0
/* CHECKSUM_CHECK_IP==0: Check checksums by hardware for incoming IP packets.*/
#define CHECKSUM_CHECK_IP 0
/* CHECKSUM_CHECK_UDP==0: Check checksums by hardware for incoming UDP packets.*/
#define CHECKSUM_CHECK_UDP 0
/* CHECKSUM_CHECK_TCP==0: Check checksums by hardware for incoming TCP packets.*/
#define CHECKSUM_CHECK_TCP 0
/* CHECKSUM_GEN_ICMP==0: Generate checksums by hardware for outgoing ICMP packets.*/
#define CHECKSUM_GEN_ICMP 0
#else
/* CHECKSUM_GEN_IP==1: Generate checksums in software for outgoing IP packets.*/
#define CHECKSUM_GEN_IP 1
/* CHECKSUM_GEN_UDP==1: Generate checksums in software for outgoing UDP packets.*/
#define CHECKSUM_GEN_UDP 1
/* CHECKSUM_GEN_TCP==1: Generate checksums in software for outgoing TCP packets.*/
#define CHECKSUM_GEN_TCP 1
/* CHECKSUM_CHECK_IP==1: Check checksums in software for incoming IP packets.*/
#define CHECKSUM_CHECK_IP 1
/* CHECKSUM_CHECK_UDP==1: Check checksums in software for incoming UDP packets.*/
#define CHECKSUM_CHECK_UDP 1
/* CHECKSUM_CHECK_TCP==1: Check checksums in software for incoming TCP packets.*/
#define CHECKSUM_CHECK_TCP 1
/* CHECKSUM_GEN_ICMP==1: Check checksums in software for outgoing ICMP packets.*/
#define CHECKSUM_GEN_ICMP 1
#endif


/*
----------------------------------------------
---------- Sequential layer options ----------
----------------------------------------------
*/
/**
* LWIP_NETCONN==1: Enable Netconn API (require to use api_lib.c)
*/
#define LWIP_NETCONN 1

/*
------------------------------------
---------- Socket options ----------
------------------------------------
*/
/**
* LWIP_SOCKET==1: Enable Socket API (require to use sockets.c)
*/
#define LWIP_SOCKET 0

/*
-----------------------------------
---------- DEBUG options ----------
-----------------------------------
*/

#define LWIP_DEBUG 1


/*
---------------------------------
---------- OS options ----------
---------------------------------
*/

#define LWIP_DNS 1
#define LWIP_ARP 1

/*#define IP_FORWARD 0*/

//#define MEM_LIBC_MALLOC 1

#define TCPIP_THREAD_STACKSIZE configMINIMAL_STACK_SIZE
#define TCPIP_MBOX_SIZE 5
#define DEFAULT_UDP_RECVMBOX_SIZE 2024
#define DEFAULT_TCP_RECVMBOX_SIZE 2024
#define DEFAULT_ACCEPTMBOX_SIZE 2024
#define DEFAULT_THREAD_STACKSIZE configMINIMAL_STACK_SIZE
#define TCPIP_THREAD_PRIO (configMAX_PRIORITIES - 3)

#define TCP_DEBUG LWIP_DBG_ON

#define LWIP_COMPAT_MUTEX 1
#define LWIP_SO_SNDTIMEO 0
#define LWIP_SO_RCVTIMEO 1
#define PPP_SUPPORT 1
#define PPPOE_SUPPORT 0
#define PPPOS_SUPPORT 1
#define PAP_SUPPORT 1
#define CHAP_SUPPORT 1
#define VJ_SUPPORT 1
#define MD5_SUPPORT 1
#define PPP_THREAD_PRIO (configMAX_PRIORITIES - 2)
#define PPP_THREAD_STACKSIZE configMINIMAL_STACK_SIZE
#define PPP_DEBUG LWIP_DBG_ON

#endif /* __LWIPOPTS_H__ */

/******************* © COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/

0
memory gap = 44952
task count = 7

udpTestTask 0 0%
IDLE 0 0%
counterTask 0 0%
blinkTask 0 0%
Eth_if 12 12%
tcpip_thread 15 15%
Tmr Svc 11 11%

udpTestTask started
1
memory gap = 44952
task count = 7

counterTask 431 <1%
IDLE 760839 76%
tcpip_thread 102363 10%
blinkTask 15 <1%
Eth_if 133518 13%
Tmr Svc 24 <1%
udpTestTask 93 <1%

2
memory gap = 44952
task count = 7

counterTask 987 <1%
IDLE 1215548 61%
tcpip_thread 336998 16%
blinkTask 22 <1%
Eth_if 437917 21%
Tmr Svc 24 <1%
udpTestTask 93 <1%

3
memory gap = 44952
task count = 7

counterTask 1560 <1%
IDLE 1679672 56%
tcpip_thread 568709 19%
blinkTask 29 <1%
Eth_if 735892 24%
Tmr Svc 24 <1%
udpTestTask 93 <1%

4
memory gap = 44952
task count = 7
assertion failed

static
void counterTask(void * pvParameters) {
(void) pvParameters;
for (int i = 0;; ++i) {
printf("%d\r\n", i);
printf("memory gap = %u\r\n", xPortGetFreeHeapSize());
printf("task count = %u\r\n", uxTaskGetNumberOfTasks());
static signed char taskInfoBuf[48 * 8];
vTaskGetRunTimeStats(taskInfoBuf + 0);
printf("%s\r\n", taskInfoBuf);
vTaskDelay(1000 / portTICK_RATE_MS);
if (i == INT_MAX) {
i = 0;
}
}
}

void ethernetif_input( void * pvParameters )
{
struct pbuf *p;

for( ;; )
{

if (xSemaphoreTake( s_xSemaphore, emacBLOCK_TIME_WAITING_FOR_INPUT)==pdTRUE)
{
GET_NEXT_FRAGMENT:
p = low_level_input( s_pxNetIf );
if (ERR_OK != s_pxNetIf->input( p, s_pxNetIf))
{
if (p != NULL) {
pbuf_free(p);
p = NULL;
}
}
else
{
xSemaphoreTake(s_xSemaphore, 0);
goto GET_NEXT_FRAGMENT;
}
}
}
}

local socket = require('socket')

local client
client, err = socket.udp()
if err then
error(err)
end
local rport = 22222
local raddress = "172.16.0.100"
_, err = client:setpeername(raddress, rport)
if err then
error(err)
end
local MAX_PAYLOAD_SIZE = 1472
local payload = string.rep('@', MAX_PAYLOAD_SIZE)
local n = 0
while true do
_, err = client:send(payload) -- never blocks
if err then
print(err)
else
n = n + 1
print(string.format('%d', n))
end
end

cat /dev/random | nc -u 172.16.0.100 22222

udpTestTask             2530110         7%
counterTask             26552           <1%
IDLE            1871340         5%
blinkTask               319             <1%
tcpip_thread            13769936                38%
Eth_if          17729671                49%
Tmr Svc         24              <1%

local socket = require('socket')

local client
client, err = socket.udp()
if err then
error(err)
end
local lport = 22222
local laddress = "172.16.0.1"
_, err = client:setsockname(laddress, lport)
if err then
error(err)
end
local rport = 22222
local raddress = "172.16.0.100"
_, err = client:setpeername(raddress, rport)
if err then
error(err)
end
local MAX_PAYLOAD_SIZE = 1472
--local payload = string.rep('@', MAX_PAYLOAD_SIZE)
local payload = ''
for i = 1, MAX_PAYLOAD_SIZE do
payload = payload .. string.char(math.random(0, 0xFF))
end
local n = 0
while true do
--[[
--stalls
local payload = ''
for i = 1, MAX_PAYLOAD_SIZE do
payload = payload .. string.char(math.random(0, 0xFF))
end
]]
_, err = client:send(payload) -- never blocks
if err then
print(err)
else
n = n + 1
print(string.format('send # = %d', n))
end
dgram, err = client:receive()
if dgram then
print(string.format('rcvd size = %d', #dgram))
else
print(err)
end
end

664.010620
663.129944
664.451843
664.231140
664.010620
663.790222
663.790222
664.231140
663.570007
663.570007
662.471008
662.690552
662.690552
663.790222
664.010620
663.790222
664.010620
664.231140
663.349915
663.570007
663.129944
663.129944
663.349915
664.010620
663.349915
663.570007
663.129944
663.349915
663.790222
664.010620
663.570007
659.630615
661.157043
664.451843
663.570007
663.129944
663.790222
664.451843
663.129944
663.570007
664.231140
664.451843

658.544617 0
658.111206 0
658.544617 0
658.544617 0
656.598816 0
655.307983 0
656.383301 0
654.878845 0
657.030212 0
656.383301 0
658.761536 0